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module-eval: evaluate shared fixture configs once

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Thirty-three module-eval fixtures were a second (or later) full
`nixosSystem` evaluation of a config another fixture already evaluated:
16 shapes defined identically in two to seven cluster files, plus
duplicates inside agent-queue-bao, core-toggle and
swarm-services-switch. Each cluster imports ./lib.nix itself, so nothing
was shared between them.

nix/module-eval/shared.nix now defines each of those 16 shapes once.
nix/checks.nix instantiates it a single time and passes it as `shared`
to the 23 clusters that read one, and each cluster rebinds the fixture
under its existing local name. Assertions are unchanged. Case text
changes only in core-toggle, where two cases built the forge-host
fixture inline and now read the file's `forgeHere`, and in two inline
`let` bindings (bao-otel-collector, grafana) that now take the shared
fixture.

Six folds are value-equal rather than textually equal: they drop an
explicit `deploy.hive-controller.enable = false` or
`deploy.swarm-otel.enable = false` that equals what the option already
resolves to for that config. Nothing under nix/host-modules sets either
option apart from the `mkDefault allSwarmServices` on swarm-otel, and
the only option-priority read there is `domain.highestPrio`.

Part of #5171.
This commit is contained in:
atlas 2026-10-13 00:55:01 +02:00 • committed by mara
commit 18ed3f5040
25 changed files with 201 additions and 147 deletions
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6
nix/module-eval/forge-placement.nix
View file

@ -11,6 +11,7 @@
lib,
self,
nixosSystem,
shared,
}:
let
inherit
@ -26,10 +27,9 @@ let
runGroup
;
bare = hive { };
inherit (shared) bare;
allLocal = hive { deploy.singleHostSwarm = true; };
servicesHere = hive { deploy.allSwarmServices = true; };
forgeHere = hive { deploy.forgejo.enable = true; };
inherit (shared) servicesHere forgeHere;
# The shared services here, the forge somewhere else. Every derivation in
# ../host-modules/swarm-required-services.nix is `mkDefault`, so this stays